Added semitone is flat 7th. Also in
the belfry is the original church bell
from 1751 (maker not reported).

*Technical data:

Traditional chime (chimestand) of 11 bells
Pitch of heaviest bell is D# in the middle octave
Transposition is nil (concert pitch)
Keyboard range: D#G / NONE
There is one added semitone
The whole instrument was installed in 1875
with bells made by Meneely/Troy
Year of latest technical information source is 2009

*Links:

The church Website has a photo of the building on
the home page.
There is an illustrated page dedicated to the bells (Historic St.Peter's -> Edifice -> Tower Room),
and more photos can be found on the Architecture page.
Another picture of the tower is on the About Us page, and yet another (showing in the background the
carillon tower of City Hall) is on the Location page.